Hello there, my fellow human being!
The first thing we need to do is work out the highest common factor of 108, 80, and 96.
108 80 96
1 x 108 1 x 80 1 x 96
2 x 54 2 x 40 2 x 48
3 x 36 4 x 20 3 x 32
4 x 27 8 x 10 4 x 24
6 x 18 6 x 16
9 x 12 8 x 12
So, the common factors are 1, 2 and 4
The highest common factor (HCF) is 4.
The greatest number of box used is 4 boxes and the number of each item in each box is...
Pens - 108/4 = 27 pens
Books - 80/4 = 20 books
Notepads - 96/4 = 24 notepads.
Hope this helped!
~Ruru